Returning to textbooks means that the relationship between textbooks and exercises can be established. On the premise of mastering the basic content of the textbook, always return to the textbook when doing problems, closely cooperate with the basic content of the textbook, and improve your understanding of your basic knowledge in the process of constantly solving problems. It also helps to answer questions.

This is a complementary process.

And to be honest, many topics are prone to problems in some basic concepts. Especially on the issue of classified discussion, it is mainly to examine the discrimination and accurate grasp of students' concepts, which makes it easy for teachers to give questions about specious concepts and increases the difficulty for students to solve problems.

For example, regarding the persistence of quadratic function and quadratic inequality, it is examined whether students realize that only when quadratic identity is not zero can they solve problems according to quadratic function or quadratic inequality, and students with weak foundation will ignore this point. Actually the concept is not clear.

Therefore, regression textbooks also contain a correct understanding of concepts. Returning to textbooks means that the relationship between textbooks and exercises can be established. On the premise of mastering the basic contents of the textbook,

When doing problems, you should always go back to the textbook, closely cooperate with the basic knowledge of the textbook, and improve your understanding of your basic knowledge in the process of constantly solving problems. It also helps to answer questions.

Learn mathematics from simple to complex, and solve problems from complex to simple. Returning to textbooks means that the relationship between textbooks and exercises can be established. On the premise of mastering the basic content of the textbook, always return to the textbook when doing problems, closely cooperate with the basic content of the textbook, and improve your understanding of your basic knowledge in the process of constantly solving problems. It also helps to answer questions.

When learning mathematics, we should try our best to expand the extension and application scope of concepts.

When you do the problem, you should decompose, divide, copy and return to the original textbook. To tell the truth, many topics are prone to problems in some basic concepts. Especially on the issue of classified discussion, it is mainly to examine the discrimination and accurate grasp of students' concepts, which makes it easy for teachers to give questions about specious concepts and increases the difficulty for students to solve problems.